Spike or Root? How to Tell on Your Phalaenopsis

Your year-old Phalaenopsis has multiple green growths pointing downward. Roots? Spikes? Here's how to decode them.

The Key Difference: Phototropism vs. Geotropism

• Flower spikes are phototropic—they grow toward light.
• Roots are geotropic—they grow downward (gravity), less influenced by light.

Simple Test

1. Position the plant so light comes from directly overhead.
2. Wait a few days.
3. Spikes will turn upward toward the light.
4. Roots will keep growing downward.

Visual Clues

• Spike tip: Flattened, mitten-shaped, often with a slight notch
• Root tip: Rounded, pointed, often silvery-green (green when wet)
• Spike: Greener, slightly flattened
• Root: Round in cross-section

Why It Matters

If they're spikes—congratulations! Blooms are coming. If roots—your plant is building energy for future spikes. Either way, it's healthy.

Send a photo if you're still unsure. Orientation to light is the definitive test.